21527822 has 4 divisors (see below), whose sum is σ = 32291736. Its totient is φ = 10763910.

The previous prime is 21527813. The next prime is 21527851. The reversal of 21527822 is 22872512.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5381954 + ... + 5381957.

It is an arithmetic number, because the mean of its divisors is an integer number (8072934).

Almost surely, 2^21527822 is an apocalyptic number.

21527822 is a deficient number, since it is larger than the sum of its proper divisors (10763914).

21527822 is a wasteful number, since it uses less digits than its factorization.

21527822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10763913.

The product of its digits is 4480, while the sum is 29.

The square root of 21527822 is about 4639.8084012166. The cubic root of 21527822 is about 278.1847795922.

The spelling of 21527822 in words is "twenty-one million, five hundred twenty-seven thousand, eight hundred twenty-two".